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Virus–Virus Interactions Impact the Population Dynamics of Influenza and the Common Cold

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Virus–Virus Interactions Impact the Population Dynamics of Influenza and the Common Cold Virus–virus interactions impact the population dynamics of influenza and the common cold Sema Nickbakhsha, Colette Maira,b, Louise Matthewsc,1, Richard Reevec, Paul C. D. Johnsonc, Fiona Thorburnd, Beatrix von Wissmanne, Arlene Reynoldsf, James McMenaminf, Rory N. Gunsong, and Pablo R. Murciaa,1 aMRC-University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, G61 1QH Glasgow, United Kingdom; bSchool of Mathematics and Statistics, College of Science and Engineering, University of Glasgow, G12 8QQ Glasgow, United Kingdom; cBoyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, G12 8QQ Glasgow, United Kingdom; dThe Queen Elizabeth University Hospital, NHS Greater Glasgow and Clyde, G51 4TF Glasgow, United Kingdom; ePublic Health, NHS Greater Glasgow and Clyde, G12 0XH Glasgow, United Kingdom; fHealth Protection Scotland, NHS National Services Scotland, G2 6QE Glasgow, United Kingdom; and gWest of Scotland Specialist Virology Centre, NHS Greater Glasgow and Clyde, G31 2ER Glasgow, United Kingdom Edited by Burton H. Singer, University of Florida, Gainesville, FL, and approved November 12, 2019 (received for review June 27, 2019) The human respiratory tract hosts a diverse community of cocirculating influenza A virus (IAV) pandemic of 2009 further galvanized viruses that are responsible for acute respiratory infections. This interest in the epidemiological interactions among respiratory shared niche provides the opportunity for virus–virus interac- viruses. It was postulated that rhinovirus (RV) may have delayed tions which have the potential to affect individual infection risks the introduction of the pandemic virus into Europe (12, 13), and in turn influence dynamics of infection at population scales. while the pandemic virus may have, in turn, interfered with ep- However, quantitative evidence for interactions has lacked suit- idemics of respiratory syncytial virus (RSV) (14, 15). Clinical able data and appropriate analytical tools. Here, we expose and studies utilizing coinfection data from diagnostic tests have also quantify interactions among respiratory viruses using bespoke suggested virus–virus interference at the host scale (13, 16, 17). analyses of infection time series at the population scale and coin- The role of adaptive immunity in driving virus interferences fections at the individual host scale. We analyzed diagnostic data that alter the population dynamics of antigenically similar virus from 44,230 cases of respiratory illness that were tested for 11 tax- strains is well known (18, 19). For example, antibody-driven onomically broad groups of respiratory viruses over 9 y. Key to our cross-immunity is believed to restrict influenza virus strain di- analyses was accounting for alternative drivers of correlated infec- versity, leading to sequential strain replacement over time (20). POPULATION BIOLOGY tion frequency, such as age and seasonal dependencies in infection Such antibody-driven virus interactions might even shape the risk, allowing us to obtain strong support for the existence of neg- temporal patterns of RSV, human parainfluenza virus (PIV), ative interactions between influenza and noninfluenza viruses and and human metapneumovirus (MPV) infections, which are tax- positive interactions among noninfluenza viruses. In mathematical onomically grouped into the same virus family (21). However, simulations that mimic 2-pathogen dynamics, we show that tran- where antigenically distant virus groups are concerned, the mech- sient immune-mediated interference can cause a relatively ubiqui- anisms are obscure, although the variety of possibilities in- tous common cold-like virus to diminish during peak activity of a cludes innate immunity, resource competition, and other cellular seasonal virus, supporting the potential role of innate immunity in driving the asynchronous circulation of influenza A and rhinovirus. Significance These findings have important implications for understanding the linked epidemiological dynamics of viral respiratory infections, an When multiple pathogens cocirculate this can lead to compet- important step towards improved accuracy of disease forecasting itive or cooperative forms of pathogen–pathogen interactions. models and evaluation of disease control interventions. It is believed that such interactions occur among cold and flu viruses, perhaps through broad-acting immunity, resulting in epidemiology | virology | ecology interlinked epidemiological patterns of infection. However, to date, quantitative evidence has been limited. We analyzed a he human respiratory tract hosts a community of viruses that large collection of diagnostic reports collected over multiple Tcocirculate in time and space, and as such it forms an eco- years for 11 respiratory viruses. Our analyses provide strong logical niche. Shared niches are expected to facilitate interspecific statistical support for the existence of interactions among re- interactions which may lead to linked population dynamics among spiratory viruses. Using computer simulations, we found that distinct pathogen species (1, 2). In the context of respiratory in- very short-lived interferences may explain why common cold fections, a well-known example is the coseasonality of influenza infections are less frequent during flu seasons. Improved un- and pneumococcus, driven by an enhanced susceptibility to sec- derstanding of how the epidemiology of viral infections is ondary bacterial colonization subsequent to influenza infection (3, interlinked can help improve disease forecasting and evalua- 4). Indeed, respiratory bacteria–bacteria and bacteria–virus inter- tion of disease control interventions. actions, and the underlying mechanisms by which they arise, are extensively studied (5–8). In contrast, evidence for the occurrence Author contributions: S.N., L.M., R.R., P.C.D.J., R.N.G., and P.R.M. designed research; S.N., of virus–virus interactions remains scarce and the potential C.M., and P.C.D.J. performed research; F.T., A.R., J.M., and R.N.G. contributed new re- agents/analytic tools; S.N., C.M., and P.C.D.J. analyzed data; and S.N., C.M., L.M., R.R., mechanisms are elusive, demanding greater research attention. P.C.D.J., F.T., B.v.W., A.R., J.M., R.N.G., and P.R.M. wrote the paper. The occurrence of such interactions may have profound economic The authors declare no competing interest. implications, if the circulation of one pathogen enhances or di- This article is a PNAS Direct Submission. minishes the infection incidence of another, through impacts on This open access article is distributed under Creative Commons Attribution License 4.0 the healthcare burden, public health planning, and the clinical (CC BY). management of respiratory illness. 1To whom correspondence may be addressed. Email: [email protected] or Early interest in the potential for interference among taxo- [email protected]. nomically distinct groups of respiratory viruses stemmed from This article contains supporting information online at https://www.pnas.org/lookup/suppl/ epidemiological observations of the temporal patterns of infec- doi:10.1073/pnas.1911083116/-/DCSupplemental. tion in respiratory virus outbreaks (9–11). More recently, the www.pnas.org/cgi/doi/10.1073/pnas.1911083116 PNAS Latest Articles | 1of9 Downloaded by guest on September 26, 2021 processes (22–25). Recent experimental models of respiratory vi- A100 rus coinfections have demonstrated several interaction-induced effects, from enhanced (26) or reduced (22, 23) viral growth to 75 the attenuation of disease (23, 24). It has also been shown that cell fusion induced by certain viruses may enhance the replication of 50 others in coinfections (26). However, despite epidemiological, clinical, and experimental indications of interactions among respiratory viruses, quantita- 25 tively robust evidence is lacking. Such evidence has been hard to Infection status (%) 0 acquire, due to a paucity of consistently derived epidemiological Jan Jul JanJulJulJan JanJul Jan JulJan JulJan Jul Jan Jul Jan Jul time-series data over a sufficient time frame to provide well- 05 06 07 08 09 10 11 12 13 powered analyses, and the lack of analytical approaches to dif- 100 B RV ferentiate true virus–virus interactions from other drivers of IAV IBV coseasonality, such as age-dependent host mixing patterns (27, 75 RSV 28) and environmental factors associated with virus survival and CoV – – AdV transmission (29 31). As a result, studies evaluating virus virus 50 MPV interactions from epidemiological time series have thus far not PIV3 PIV1 accounted for such alternative drivers of coseasonality. PIV4 Here, we apply a series of statistical approaches and provide 25 PIV2 robust statistical evidence for the existence of interactions among prevalence Relative 0 respiratory viruses. We examined virological diagnostic data 05 06 07 08 09 10 11 12 13 from 44,230 episodes of respiratory illness accrued over a 9-y Year time frame in a study made possible by the implementation of multiplex-PCR methods in routine diagnostics that allow the Fig. 1. Temporal patterns of viral respiratory infections detected among simultaneous detection of multiple viruses from a single respi- patients in Glasgow, United Kingdom, 2005 to 2013. (A) Percentage of pa- ratory specimen. Each patient was
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